A sample of adolescents are questioned about their cigarette smoking behavior.  This is an example of

________________ influence some mental disorders, including schizophrenia, bipolar disorder, autism, and attention deficit hyperactivity disorder.

Symptoms are likely to begin appearing and the person is vulnerable to opportunistic infections and certain tumors when the number of T4 cells drops below which level.

Case reports are used to alert health officials to a new disease.

FEMA supplied trailers for people whose homes had been destroyed during Hurricane Katrina. Later it became apparent that the air in these trailers was contaminated with unhealthy levels of:

What disease decimated the Native American populations because they had no immunity to it?

This individual won the Nobel Prize in Medicine for discovering prions.

In which state does the law allow health care institutions to withdraw life support when further treatment is judged futile, even against the wishes of the patient as expressed in an advance directive?

The practice of cooking with a high amount of salt is associated with an increase in blood pressure and strokes.  This statement is an example of which of these influences on health?

Which of thse individuals is considered overweight?